1 /*
2 * Copyright (c) 1988, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char copyright[] =
10 "@(#) Copyright (c) 1988, 1990, 1993\n\
11 The Regents of the University of California. All rights reserved.\n";
12 #endif /* not lint */
13
14 #ifndef lint
15 static char sccsid[] = "@(#)shutdown.c 8.4 (Berkeley) 04/28/95";
16 #endif /* not lint */
17
18 #include <sys/param.h>
19 #include <sys/time.h>
20 #include <sys/resource.h>
21 #include <sys/syslog.h>
22
23 #include <ctype.h>
24 #include <fcntl.h>
25 #include <pwd.h>
26 #include <setjmp.h>
27 #include <signal.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <tzfile.h>
32 #include <unistd.h>
33
34 #include "pathnames.h"
35
36 #ifdef DEBUG
37 #undef _PATH_NOLOGIN
38 #define _PATH_NOLOGIN "./nologin"
39 #undef _PATH_FASTBOOT
40 #define _PATH_FASTBOOT "./fastboot"
41 #endif
42
43 #define H *60*60
44 #define M *60
45 #define S *1
46 #define NOLOG_TIME 5*60
47 struct interval {
48 int timeleft, timetowait;
49 } tlist[] = {
50 10 H, 5 H, 5 H, 3 H, 2 H, 1 H, 1 H, 30 M,
51 30 M, 10 M, 20 M, 10 M, 10 M, 5 M, 5 M, 3 M,
52 2 M, 1 M, 1 M, 30 S, 30 S, 30 S,
53 0, 0,
54 };
55 #undef H
56 #undef M
57 #undef S
58
59 static time_t offset, shuttime;
60 static int dofast, dohalt, doreboot, killflg, mbuflen;
61 static char *nosync, *whom, mbuf[BUFSIZ];
62
63 void badtime __P((void));
64 void die_you_gravy_sucking_pig_dog __P((void));
65 void doitfast __P((void));
66 void finish __P((int));
67 void getoffset __P((char *));
68 void loop __P((void));
69 void nolog __P((void));
70 void timeout __P((int));
71 void timewarn __P((int));
72 void usage __P((void));
73
74 int
main(argc,argv)75 main(argc, argv)
76 int argc;
77 char *argv[];
78 {
79 extern int optind;
80 register char *p, *endp;
81 struct passwd *pw;
82 int arglen, ch, len, readstdin;
83
84 #ifndef DEBUG
85 if (geteuid()) {
86 (void)fprintf(stderr, "shutdown: NOT super-user\n");
87 exit(1);
88 }
89 #endif
90 nosync = NULL;
91 readstdin = 0;
92 while ((ch = getopt(argc, argv, "-fhknr")) != EOF)
93 switch (ch) {
94 case '-':
95 readstdin = 1;
96 break;
97 case 'f':
98 dofast = 1;
99 break;
100 case 'h':
101 dohalt = 1;
102 break;
103 case 'k':
104 killflg = 1;
105 break;
106 case 'n':
107 nosync = "-n";
108 break;
109 case 'r':
110 doreboot = 1;
111 break;
112 case '?':
113 default:
114 usage();
115 }
116 argc -= optind;
117 argv += optind;
118
119 if (argc < 1)
120 usage();
121
122 if (dofast && nosync) {
123 (void)fprintf(stderr,
124 "shutdown: incompatible switches -f and -n.\n");
125 usage();
126 }
127 if (doreboot && dohalt) {
128 (void)fprintf(stderr,
129 "shutdown: incompatible switches -h and -r.\n");
130 usage();
131 }
132 getoffset(*argv++);
133
134 if (*argv) {
135 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
136 arglen = strlen(*argv);
137 if ((len -= arglen) <= 2)
138 break;
139 if (p != mbuf)
140 *p++ = ' ';
141 memmove(p, *argv, arglen);
142 p += arglen;
143 }
144 *p = '\n';
145 *++p = '\0';
146 }
147
148 if (readstdin) {
149 p = mbuf;
150 endp = mbuf + sizeof(mbuf) - 2;
151 for (;;) {
152 if (!fgets(p, endp - p + 1, stdin))
153 break;
154 for (; *p && p < endp; ++p);
155 if (p == endp) {
156 *p = '\n';
157 *++p = '\0';
158 break;
159 }
160 }
161 }
162 mbuflen = strlen(mbuf);
163
164 if (offset)
165 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
166 else
167 (void)printf("Shutdown NOW!\n");
168
169 if (!(whom = getlogin()))
170 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
171
172 #ifdef DEBUG
173 (void)putc('\n', stdout);
174 #else
175 (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
176 {
177 int forkpid;
178
179 forkpid = fork();
180 if (forkpid == -1) {
181 perror("shutdown: fork");
182 exit(1);
183 }
184 if (forkpid) {
185 (void)printf("shutdown: [pid %d]\n", forkpid);
186 exit(0);
187 }
188 }
189 #endif
190 openlog("shutdown", LOG_CONS, LOG_AUTH);
191 loop();
192 /* NOTREACHED */
193 }
194
195 void
loop()196 loop()
197 {
198 struct interval *tp;
199 u_int sltime;
200 int logged;
201
202 if (offset <= NOLOG_TIME) {
203 logged = 1;
204 nolog();
205 }
206 else
207 logged = 0;
208 tp = tlist;
209 if (tp->timeleft < offset)
210 (void)sleep((u_int)(offset - tp->timeleft));
211 else {
212 while (offset < tp->timeleft)
213 ++tp;
214 /*
215 * Warn now, if going to sleep more than a fifth of
216 * the next wait time.
217 */
218 if (sltime = offset - tp->timeleft) {
219 if (sltime > tp->timetowait / 5)
220 timewarn(offset);
221 (void)sleep(sltime);
222 }
223 }
224 for (;; ++tp) {
225 timewarn(tp->timeleft);
226 if (!logged && tp->timeleft <= NOLOG_TIME) {
227 logged = 1;
228 nolog();
229 }
230 (void)sleep((u_int)tp->timetowait);
231 if (!tp->timeleft)
232 break;
233 }
234 die_you_gravy_sucking_pig_dog();
235 }
236
237 static jmp_buf alarmbuf;
238
239 void
timewarn(timeleft)240 timewarn(timeleft)
241 int timeleft;
242 {
243 static int first;
244 static char hostname[MAXHOSTNAMELEN + 1];
245 FILE *pf;
246 char wcmd[MAXPATHLEN + 4];
247
248 if (!first++)
249 (void)gethostname(hostname, sizeof(hostname));
250
251 /* undoc -n option to wall suppresses normal wall banner */
252 (void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
253 if (!(pf = popen(wcmd, "w"))) {
254 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
255 return;
256 }
257
258 (void)fprintf(pf,
259 "\007*** %sSystem shutdown message from %s@%s ***\007\n",
260 timeleft ? "": "FINAL ", whom, hostname);
261
262 if (timeleft > 10*60)
263 (void)fprintf(pf, "System going down at %5.5s\n\n",
264 ctime(&shuttime) + 11);
265 else if (timeleft > 59)
266 (void)fprintf(pf, "System going down in %d minute%s\n\n",
267 timeleft / 60, (timeleft > 60) ? "s" : "");
268 else if (timeleft)
269 (void)fprintf(pf, "System going down in 30 seconds\n\n");
270 else
271 (void)fprintf(pf, "System going down IMMEDIATELY\n\n");
272
273 if (mbuflen)
274 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
275
276 /*
277 * play some games, just in case wall doesn't come back
278 * probably unecessary, given that wall is careful.
279 */
280 if (!setjmp(alarmbuf)) {
281 (void)signal(SIGALRM, timeout);
282 (void)alarm((u_int)30);
283 (void)pclose(pf);
284 (void)alarm((u_int)0);
285 (void)signal(SIGALRM, SIG_DFL);
286 }
287 }
288
289 void
timeout(signo)290 timeout(signo)
291 int signo;
292 {
293 longjmp(alarmbuf, 1);
294 }
295
296 void
die_you_gravy_sucking_pig_dog()297 die_you_gravy_sucking_pig_dog()
298 {
299
300 syslog(LOG_NOTICE, "%s by %s: %s",
301 doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
302 (void)sleep(2);
303
304 (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
305 if (killflg) {
306 (void)printf("\rbut you'll have to do it yourself\r\n");
307 finish(0);
308 }
309 if (dofast)
310 doitfast();
311 #ifdef DEBUG
312 if (doreboot)
313 (void)printf("reboot");
314 else if (dohalt)
315 (void)printf("halt");
316 if (nosync)
317 (void)printf(" no sync");
318 if (dofast)
319 (void)printf(" no fsck");
320 (void)printf("\nkill -HUP 1\n");
321 #else
322 if (doreboot) {
323 execle(_PATH_REBOOT, "reboot", "-l", nosync, 0);
324 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT);
325 perror("shutdown");
326 }
327 else if (dohalt) {
328 execle(_PATH_HALT, "halt", "-l", nosync, 0);
329 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
330 perror("shutdown");
331 }
332 (void)kill(1, SIGTERM); /* to single user */
333 #endif
334 finish(0);
335 }
336
337 #define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2;
338
339 void
getoffset(timearg)340 getoffset(timearg)
341 register char *timearg;
342 {
343 register struct tm *lt;
344 register char *p;
345 time_t now;
346
347 if (!strcasecmp(timearg, "now")) { /* now */
348 offset = 0;
349 return;
350 }
351
352 (void)time(&now);
353 if (*timearg == '+') { /* +minutes */
354 if (!isdigit(*++timearg))
355 badtime();
356 offset = atoi(timearg) * 60;
357 shuttime = now + offset;
358 return;
359 }
360
361 /* handle hh:mm by getting rid of the colon */
362 for (p = timearg; *p; ++p)
363 if (!isascii(*p) || !isdigit(*p))
364 if (*p == ':' && strlen(p) == 3) {
365 p[0] = p[1];
366 p[1] = p[2];
367 p[2] = '\0';
368 }
369 else
370 badtime();
371
372 unsetenv("TZ"); /* OUR timezone */
373 lt = localtime(&now); /* current time val */
374
375 switch(strlen(timearg)) {
376 case 10:
377 lt->tm_year = ATOI2(timearg);
378 /* FALLTHROUGH */
379 case 8:
380 lt->tm_mon = ATOI2(timearg);
381 if (--lt->tm_mon < 0 || lt->tm_mon > 11)
382 badtime();
383 /* FALLTHROUGH */
384 case 6:
385 lt->tm_mday = ATOI2(timearg);
386 if (lt->tm_mday < 1 || lt->tm_mday > 31)
387 badtime();
388 /* FALLTHROUGH */
389 case 4:
390 lt->tm_hour = ATOI2(timearg);
391 if (lt->tm_hour < 0 || lt->tm_hour > 23)
392 badtime();
393 lt->tm_min = ATOI2(timearg);
394 if (lt->tm_min < 0 || lt->tm_min > 59)
395 badtime();
396 lt->tm_sec = 0;
397 if ((shuttime = mktime(lt)) == -1)
398 badtime();
399 if ((offset = shuttime - now) < 0) {
400 (void)fprintf(stderr,
401 "shutdown: that time is already past.\n");
402 exit(1);
403 }
404 break;
405 default:
406 badtime();
407 }
408 }
409
410 #define FSMSG "fastboot file for fsck\n"
411 void
doitfast()412 doitfast()
413 {
414 int fastfd;
415
416 if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
417 0664)) >= 0) {
418 (void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
419 (void)close(fastfd);
420 }
421 }
422
423 #define NOMSG "\n\nNO LOGINS: System going down at "
424 void
nolog()425 nolog()
426 {
427 int logfd;
428 char *ct;
429
430 (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */
431 (void)signal(SIGINT, finish);
432 (void)signal(SIGHUP, finish);
433 (void)signal(SIGQUIT, finish);
434 (void)signal(SIGTERM, finish);
435 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
436 0664)) >= 0) {
437 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
438 ct = ctime(&shuttime);
439 (void)write(logfd, ct + 11, 5);
440 (void)write(logfd, "\n\n", 2);
441 (void)write(logfd, mbuf, strlen(mbuf));
442 (void)close(logfd);
443 }
444 }
445
446 void
finish(signo)447 finish(signo)
448 int signo;
449 {
450 if (!killflg)
451 (void)unlink(_PATH_NOLOGIN);
452 exit(0);
453 }
454
455 void
badtime()456 badtime()
457 {
458 (void)fprintf(stderr, "shutdown: bad time format.\n");
459 exit(1);
460 }
461
462 void
usage()463 usage()
464 {
465 fprintf(stderr, "usage: shutdown [-fhknr] shutdowntime [ message ]\n");
466 exit(1);
467 }
468